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Arc-1 Radon Detection

Swansea, Illinois. Testing

1 Illinois state license verified against the Illinois Emergency Management Agency (IEMA) list, last checked November 11, 2026.

Call Arc-1 Radon Detection at (618) 606-5542

Credentials

Licenses and certifications

1 credential is on file for this business, exactly as the issuer's list printed it.

Illinois state license (1)

Issued by the Illinois Emergency Management Agency (IEMA), not by NRPP or NRSB. Radon411 last checked the list on November 11, 2026. No expiry date is on the record.

LicenseNumberStatus on the listVerifiedCheck with the issuer
Testing licenseNo. RNI2021224Measurement ProfessionalVerified November 11, 2026Verify RNI2021224 with the Illinois Emergency Management Agency (IEMA) (opens in a new tab)

Licensing in Illinois

Illinois's radon program says the state licenses or certifies radon professionals.

IEMA-OHS Radon Program, Illinois Emergency Management Agency and Office of Homeland Security, (800) 325-1245.

What Illinois requires, in its program’s own words, and how to check a credential

Local radon figures

Radon in Swansea

Swansea lies in St. Clair County, where 33.7% of 5,193 radon tests reported to CDC (2017) were at or above 4 pCi/L, 0.0 points below Illinois pooled (33.7%), 52nd of 70 Illinois counties with 30 or more tests.

Radon test figures for the county Swansea lies in
CountyTestsAt or above 4 pCi/LMedianIllinois, pooledRank in the stateEPA zone
St. Clair County5,19333.7%2.6 pCi/L33.7%52 of 70Zone 2

Shares of tests people chose to run and report, by county (2017); the state's is its counties' counts added up, calculated by Radon411. Only a test measures a home.

The counties around Swansea

Around St. Clair County, where Swansea lies, the nearest Illinois counties with a CDC figure for 2017 run from 11.8% to 39.9% of tests at or above 4 pCi/L; the closest, Monroe County, is 19 miles away at 39.9%.

The nearest Illinois counties to St. Clair County with 30 or more tests, 2017
CountyDistanceTestsAt or above 4 pCi/LMedian
Monroe County19 mi71439.9%3.0 pCi/L
Madison County25 mi5,21429.5%2.6 pCi/L
Clinton County29 mi58237.6%3.0 pCi/L
Washington County29 mi5111.8%2.0 pCi/L
Randolph County29 mi6035.0%2.9 pCi/L
Bond County39 mi7532.0%2.6 pCi/L

Nearby

Radon professionals nearest Swansea

More radon professionals in SwanseaMore radon professionals in Illinois

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